An elementary approach has been suggested to
calculate the external quantum efficiency (EQE) of polymer light
emitting diodes (PLEDs). This approach requires only the electroluminescence
(EL) spectrum and illumination versus current characteristics of the devices to
calculate the EQE. In these calculations the light emission has been considered to be perfectly
diffusive from the emission surface. The efficiencies calculated in this way
have been compared
with the actual values of the EQEs for the different PLED structures
available in the literature. The calculated values have shown good agreement
with the measured values.

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